吡虫啉等种子包衣防治小麦蚜虫与其持效机理初探

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1、山东农业大学硕士学位论文AbstractWheataphidisanimportantpestofwinterwheat．Innormalcase，themainmethodtocontrolwheataphidswasusechemicalpesticide．NeonicotinoidpesticidesRrewidelyusedtocontrolwheataphidsinrecentyears．Imidacloprid，弱therepresentativeofneonicotinoids，coatingwheatseedsagai

2、nstaphidsshowedgoodcontroleffectandhaslessimpactonthenaturalenemiesinsectsandconvenienttouse．Theapplicationofotherneonicotinoidsseedcoatingtocontrolwheataphidswererarelyreported．Whiletherewerefewstudiesonthemechanismforimidaclopridseedcoatingcontrolwheataphidsforthewhol

3、egrowingperiod．Wheatseedsweretreated、杭tlleitherimidacloprid，thiamethoxam，acetamiprid，nitenpyramorthiaclopridbeforesowingandthecontroleffectandsafetyofseeddressing、衍mdifferentpesticidesagainstwheataphidandthepesticideresidueinwheatkernelsandyieldandtheinfluenceonnatulltl

4、enemiesofwheataphidswereinvestigatedinordertostudythefeasibilityofseeddressing、析tllneonicotinoidinsecticidesagainstwheataphid．Inordertoexplorethereasonofwheatseedstreated、析也imidaclopridcontrolwheataphidsfortheentiredevelopmentalperiod．Thespeciesandthepopulationdensityof

5、wheataphidsandtheamountofpesticideresidueindifferentpartsofthewheatweredeterminedatdifferentgrowthperiodsafterwinterseedweretreatedwithimidacloprid．Themaincontentsare弱thefollowingaspects：1．Thesafetyofseeddressing谢m2．40，3．60and4．80g(a．i)／kgofeitherimidacloprid，thiamethox

6、am，acetamiprid，nitenpyramorthiaclopridbeforesowingWasstudiedand州tllthetreatmentofsprayingclearwater躯CK．Theresultsshowedthatunderdifferenttreatments，allofthepesticideshadnoinfluenceontheemergencerateexceptacetamiprid．2．Wheatseedsweretreated、vim2．40，3．60and4．80g(a。i)／kgof

7、eitherimidacloprid，thiamethoxam，acetamiprid，nitenpyramorthiaclopridbeforesowingandthecontroleffectagainstwheataphidWaSinvestigated．Theresultsshowsthatseeddressing埘tllimidacloprid，thiamethoxamandnitenpyramhadgoodcontrolefficacytowheataphidsandthecontrolefficacyWasranked勰

8、thatimidacloprid>thiamethoxam>nitenpyram．Seedsdressedwith3．60and4．80g(a．i)／kgofeitherimidaclopridorthiamethoxa